/**
 * VoiceIDVault SDK — internal HTTP layer.
 * Shared by VoiceIDVaultClient and all sub-namespaces.
 * @internal
 */
import { VoiceIDVaultError } from './errors.js';
export interface RequestConfig {
    readonly baseUrl: string;
    readonly apiKey: string;
    readonly timeout: number;
    readonly retries: number;
}
/** Function type accepted by sub-namespaces (bound from makeRequest). */
export type RequestFn = <T>(method: 'GET' | 'POST' | 'DELETE', path: string, body?: unknown, ErrorClass?: typeof VoiceIDVaultError) => Promise<T>;
/**
 * Make an authenticated HTTP request with exponential-backoff retry.
 * Retries: 5xx server errors and network failures.
 * Does not retry: 4xx client errors.
 */
export declare function makeRequest<T>(config: RequestConfig, method: 'GET' | 'POST' | 'DELETE', path: string, body?: unknown, ErrorClass?: typeof VoiceIDVaultError): Promise<T>;
/** Convert a Blob or ArrayBuffer to base64. Works in browser and Node.js. */
export declare function toBase64(data: Blob | ArrayBuffer): Promise<string>;
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